Bug report perhaps

In the following code, I have used the flex: shorthand(flex-grow:, flex-shrink:, flex-basis:) to solve this challenge.
However, the editor will recognize that flex-basis: has been assigned yet not recognize the value.
This is conflicting behavior, as I was able to complete the prior challenges by substituting flex-grow: and flex-shrink: with the flex: shorthand.

I may have just missed something but I thought I’d share:

#box-container {
  display: flex;
  height: 500px;

#box-1 {
  background-color: dodgerblue;
  height: 200px;
  flex: 0 1 10em;

#box-2 {
  background-color: orangered;
  height: 200px;
  flex: 0 1 20em;

<div id="box-container">
<div id="box-1"></div>
<div id="box-2"></div>

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User Agent is: Chrome/79.0.3945.88.

Challenge: Use the flex-basis Property to Set the Initial Size of an Item

Link to the challenge: